package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品和其的口味
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //插入一条数据
        dishMapper.insert(dish);//插入菜品数据
        Long dishId = dish.getId();//获取到 insert生成的主键值 菜品id
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));//设置菜品id
            //向口味表中插入多条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }
    /**
     * 分页查询菜品
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //开始分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        long total = page.getTotal();
        List<DishVO> records = page.getResult();
        PageResult pageResult = new PageResult(total, records);
        return pageResult;
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional //添加事务注解
    public void delete(List<Long> ids) {
        //判断当前菜品是否可以删除  是否起售中
        ids.forEach(id -> {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });
        //判断当前菜品是否可以删除  当前菜品是否被套餐关联
        List<Long> setmealDishIds = setmealDishMapper.getSetmealByDishIds(ids);
        if(setmealDishIds != null && setmealDishIds.size() > 0){
            //套餐关联
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
//        ids.forEach(id -> {dishMapper.deleteById(id);
//        //删除菜品表中的口味数据
//        dishFlavorMapper.deleteByDishId(id);
//        });

        //优化删除
        //根据菜品ids批量删除菜品数据
        dishMapper.deleteByIds(ids);
        //根据菜品ids批量删除菜品口味
        dishFlavorMapper.deleteByDishIds(ids);
    }
    /**
     * 根据id 查询菜品数据
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //1.根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //2.根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }
    /**
     * 修改菜品
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        //1.修改菜品表，执行update
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        //2.修改口味表，执行update
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            //删除当前菜品对应的口味数据
            dishFlavorMapper.deleteByDishId(dishDTO.getId());
            //重新插入口味数据
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId())); //设置 dishId
            dishFlavorMapper.insertBatch(flavors);
        }
    }
    /**
     * 菜品的启售停售
     * @param status
     * @param id
     */
    @Override
    @Transactional//添加事务注解
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.updateById(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> listBycategoryId(Integer categoryId) {
        List<Dish> list = dishMapper.listBycategoryId(categoryId);
        return list;
    }
}
